I recently adopted an orphaned kitten. He is about 4-5 weeks old and just started playing. He is doing really well but he likes to bite hands, feet, anything, and to stalk you and jump on you, mainly your face. I have tried scruffing him like a mother cat would, hissing at him when he does it, or meowing loudly like another kitten would. It helps in the moment but he is back at it the next time he wants to play. I know he is just playing but it hurts, and I have a 5 month old son who would not be very happy getting bitten or scratched. What can I do to break his habit?